TS5220A 4Pin Round Button SPST Straight Tactile Switch SMD
The TS5220A 4Pin Round Button SPST Straight Tactile Switch SMD is a compact surface-mount momentary push-button switch designed for PCB-based electronic projects, control panels, embedded systems, Arduino projects, IoT devices, and consumer electronics. It uses a 4-pin SMD package, round actuator, and SPST switching configuration, making it suitable where a small, low-profile tactile input is required.
The commonly listed SHOU HAN TS5220A specification is 5.2 × 5.2 mm package size, 2 mm height, 12 V rating, 50 mA contact current, 2.5 N operating force, and up to 100,000 switching cycles.
Its compact 5.2 × 5.2 × 2.0 mm form factor is particularly useful for space-constrained PCB designs. The switch is vertically mounted and uses gull-wing SMD terminals for PCB assembly.
Key Features
- Model: TS5220A
- Type: Tactile Push Button Switch
- Configuration: SPST
- Number of Pins: 4
- Mounting: SMD / SMT
- Actuator: Round Button
- Package: SMD-4P, approximately 5.2 × 5.2 mm
- Switch Height: Approximately 2 mm
- Voltage Rating: 12 V
- Contact Current: 50 mA
- Operating Force: Approximately 2.5 N / 250 gf
- Electrical Life: Up to 100,000 cycles
- Termination: Gull Wing SMD
- Mounting Orientation: Vertical
- Operating Temperature: Approximately −20°C to +80°C for the commonly listed TS5220A variant
- RoHS: Listed as RoHS compliant by major component distributors
Important: TS5220A is available in variants with different operating forces and temperature specifications. For example, some listings identify a 250 gf version while another TS5220A listing specifies 160 gf. Verify the exact variant before production use.
Specifications:
| Specification | Details |
|---|---|
| Product Name | TS5220A 4Pin Round Button Tactile Switch |
| Switch Type | Tactile Push Button |
| Circuit | SPST |
| Pins | 4 Pin |
| Mounting Type | SMD / SMT |
| Package | SMD-4P |
| PCB Footprint | Approximately 5.2 × 5.2 mm |
| Length | Approximately 5.15–5.2 mm |
| Width | Approximately 5.15–5.2 mm |
| Height | 2 mm |
| Actuator Type | Round Button |
| Mounting Orientation | Vertical |
| Terminal Type | Gull Wing |
| Rated Voltage | 12 V |
| Rated Current | 50 mA |
| Operating Force | 2.5 N / 250 gf typical listed version |
| Travel | Approximately 0.25 mm for the 250 gf specification |
| Electrical Life | 100,000 cycles |
| Contact Resistance | ≤100 mΩ for the documented 250 gf variant |
| Insulation Resistance | ≥100 MΩ |
| Operating Temperature | −20°C to +80°C typical listed version |
| Lamp | No |
| Bracket | Without Bracket |
| Actuator/Cap | Round |
| Compliance | RoHS listed |
The detailed 250 gf specification also lists 0.25 ± 0.10 mm travel, ≤100 mΩ contact resistance, ≥100 MΩ insulation resistance, and 100,000-cycle life.
How the 4 Pins Work
Although the switch has four physical terminals, it is an SPST momentary switch. Internally, two pins on one side are electrically connected, and the two pins on the opposite side form the other contact. Pressing the button connects the two sides.
This means you normally only need one pin from each side for the switching signal. The duplicate pins can provide mechanical stability and convenient PCB routing.
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